The first thing you need to know about growing English ivy indoors is that it needs bright light. Without enough light, ivy will become leggy, sickly, and prone to pests. Variegated ivies may lose their color variation if they don’t have enough light. Direct summer sun from a south-facing window can lead to leaf burn, however, so indirect light is best. The plant prefers to be at cooler temperatures, like in the 60s (F), and likes humidity.